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Welcome to the MOC. Did they install lithium? How many amp hours? Do you have a residential fridge? How many hours of sun?
If lithium, they shut off charging at 32 degrees to prevent damaging the batteries. Do they have built in heaters? If not they the BMS will shut off charging at 32 degrees. If they do, the heaters may be turned off.
Do you have the Victron app? If not then you need to download it. It will allow you to set the charger to the required settings. It will also allow you to view your solar production. See the attached pictures.
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Tony & Donna
2022 Montana HC, 295RL, Solar Flex 400, Onan 3600 LPG, 2K inverter, 200AH Lithium. 2020 GMC Denali 2500 6.6 Duramax, Demco 21K Auto Slide
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